How does Dunwoody's water compare to the national average?

The USA national average is 151 mg/L. Dunwoody (≈ 120–179 mg/L) is 1 mg/L softer than average.

Dunwoody Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

106 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Dunwoody, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Dunwoody	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Dunwoody compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Dunwoody, Georgia	≈ 120–179 mg/L	3.5 ppt	🟠 Hard	reservoir
Sandy Springs, Georgia	≈ 120–179 mg/L	4.9 ppt	🟠 Hard	reservoir
Chamblee, Georgia	≈ 0–60 mg/L	9.5 ppt	🟢 Soft	reservoir
Doraville, Georgia	≈ 0–60 mg/L	8.1 ppt	🟢 Soft	reservoir
Roswell, Georgia	≈ 0–60 mg/L	63.8 ppt	🟢 Soft	reservoir

National Benchmark

How Dunwoody compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Dunwoody	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Dunwoody's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 106 mg/LpH: 7

Dunwoody, Georgia is served by the DeKalb County Department of Watershed Management (DWM), which provides drinking water to residents across DeKalb County including the city of Dunwoody. The utility sources water from the Chattahoochee River and supplementary groundwater supplies. Treatment facilities process this water to meet all state and federal drinking water quality standards. DeKalb County released its 2025 Drinking Water Quality Report (Consumer Confidence Report) confirming continued compliance with all regulatory requirements.

The Chattahoochee River watershed drains the northern Georgia Piedmont and Blue Ridge regions. Underlying geology consists of Precambrian metamorphic basement rocks — primarily gneiss and schist — overlain by Paleozoic metasedimentary formations typical of the Georgia Piedmont province. This crystalline and metamorphic bedrock contributes moderate levels of dissolved minerals, particularly calcium and magnesium, resulting in a moderately mineralized water supply characteristic of the region.

Dunwoody's water is moderately hard, meaning residents may notice some scale buildup on fixtures and appliances over time, though effects are generally mild. Soap and detergent performance may be slightly reduced, and minor spotting on glassware can occur. Most residents do not require a water softener, though those concerned about appliance longevity may choose point-of-use filters. Regular descaling of water heaters and fixtures helps mitigate mineral accumulation. All water meets EPA and Georgia Department of Public Health standards per the 2025 Consumer Confidence Report.

Geology & Source: Georgia Piedmont Precambrian metamorphic terrain; gneiss and schist with Paleozoic metasedimentary formations — crystalline bedrock yields moderate hardness from dissolved calcium and magnesium

Other Georgia Water Reports

Sandy Springs

≈ 120–179 mg/L

🟠 Hard

Chamblee

≈ 0–60 mg/L

🟢 Soft

Doraville

≈ 0–60 mg/L

🟢 Soft

Roswell

≈ 0–60 mg/L

🟢 Soft

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Dunwoody's water safe to drink?

Yes. Dunwoody's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Dunwoody?

At ≈ 120–179 mg/L (Hard), Dunwoody's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Dunwoody compare to the USA average?

The USA national average is 151 mg/L. Dunwoody (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Dunwoody is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.